ADI Sprocke Tensile strength of 1400 MPa, elongation of 2%
The austempered ductile iron (ADI) is a type of ductile iron that
has been heat-treated to improve its mechanical properties. The
process involves two main steps: austenitizing and tempering.
1.Austenitizing: In this step, the ductile iron is heated to a high
temperature to transform the ferrite and pearlite in the matrix
into austenite. This is typically done at temperatures around 900°C
to 950°C (1652°F to 1742°F). During this phase, carbon from the
graphite nodules diffuses into the austenite, increasing its carbon
content.
2.Tempering: After austenitizing, the material is rapidly cooled to
a lower temperature, typically between 230°C to 400°C (446°F to
752°F), where it is held for several hours. This allows for the
formation of bainite, which is a mixture of ferrite and high-carbon
austenite. The high-carbon austenite is unstable and eventually
transforms into a fine mixture of ferrite and carbides.
The unique mechanical properties of ADI are due to its
microstructure, which consists of:
1.Graphite nodules: These provide internal lubrication, making ADI
self-lubricating and reducing wear.
2.Bainite: This provides high strength and toughness.
3.Retained austenite: This contributes to the ductility and energy
absorption capacity of the material.
The combination of these properties makes ADI an attractive
material for power train components such as gears and gearbox
parts, where high strength, ductility, toughness, wear resistance,
and machinability are desired.
Preheating Process
Use a preheating furnace for preheating.
Initial Heating Process
Use a box-type heating furnace for the initial heat treatment
Product Transportation
Use rail carts to move products.
Product Cleaning
Use a cleaning machine to clean the products.
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